White light, battery is too low or you have a short (strings are touching) each string must be completely isolated for the others, they are used to transmit the power and signal form the MCK to the CPU.

Usually, the white light is a result of 2 strings touching, or YOU accidently making them touch something. If they are touching a fret, or your hand, you can get the white light. Also, when in doubt, Fresh strings always make the guitar happier. I have a Robot SG, and a Darkfire.. both will start acting up when the strings are aging.